@article{DAN_1974_219_3_a3,
     author = {B. A. Dubrovin and S. P. Novikov},
     title = {A periodicity problem for the {Korteweg--de} {Vries} and {Sturm--Liouville} equations. {Their} connection with algebraic geometry},
     journal = {Doklady Akademii Nauk},
     pages = {531--534},
     publisher = {mathdoc},
     volume = {219},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_3_a3/}
}